Multiple branch nodes from a single topic

I am creating a subclass/superclass taxonomy with MindMananger. Say I have a topic (superclass) with 10 subtopics (subclasses). Currently, all of the subtopics are connected to the parent with a single expand/collapse node (+/-). Is there any way to create a /second/ expand/collapse node so that I can group 5 subtopics on one node and 5 subtopics on the other so that each group of 5 can be expanded/collapsed independently?

Thanks for the reply, Ary - At the juncture of where the 10 subtopics branch from L1T1 in the image below, there is a circle with a minus sign in it and 10 links branch from there. I would like two of these expand/collapse circle branching from L1T1 (the first with 1-5 and second with 6-10) that I could expand/collapse independently without introducing new subtopics to group 1-5 and 6-10. I think the answer is probably "can't do that" but I wanted to check with some experts anyway.

(And on a separate topic, do you know what the little circle is/does that is at the joint between the main topic and L1T1 and L1T2?)

The solution is (see my first response) to introduce two subtopics that have no text or name, between L1T1 and the L2 topics. You may format them to get rid of lines and colours. The empty subtopics are there, but you don't see them, just the plus/minus.

If you point your mouse at the little circle, you see a plus sign and click left, you can drag the topic and all that is connected to any place on your map. If you Shift click it, you can uncouple it from the parent topic.Try it.

Thanks, Guys. I actually tried your approach, Ary. It didn't work because - part of the story I haven't told yet - when I export to Word, the unnamed invisible node shows up as a Word Heading if its subtopics have content. And I want it to be completely ignored in the export; skip empty topics doesn't work if subnodes have content. (Actually, I think having an unnamed node caused MM to crash - I only tried it once.) So my problem actually entails what I eventually want to do with the Word output document. I think I'll go back to this approach and use an editorial convention on the Word document work get what I want. Thanks again.

One option might be to use the WordX add-in for export. This gives you a lot more control over the export process and among other things allows you to specify which topics or subtopics are exported and the level at which they will be exported. Therefore you could tell it to ignore invisible topics and also to "promote" the invisible topic's subtopics if that's what you want to do.